A suicide bomber killed the chief of police of Iraq's main northern city of Mosul and two other officers on Thursday as they were travelling to the scene of an earlier blast, the US military said.
Brigadier General Salah al-Juburi had previously been reported wounded in the bombing, which struck as he travelled to a three storey apartment block levelled in a bombing on Wednesday which killed 18 people.
"A suicide bomber detonated a vest bomb at the site of yesterday's bombing in Mosul, Iraq," the US military said.
"Two Iraqi police were killed in the blast, and one Iraqi army and one coalition force soldier was injured.
"Brigadier General Salah, the provincial director of police, was also killed in the blast."
The US military said that the bomber had been disguised as a policeman.
"The Iraqi army and coalition forces have determined that the suicide bomber was an imposter wearing an Iraqi police uniform," it said.
"Coalition forces are working closely with Iraqi security forces in a joint investigation."
The military blamed the attack on Al-Qaeda which has made Iraq's third city a major base for its operations.
"This cowardly behaviour is yet another example of Al Qaeda in Iraq's complete disregard for human life and another attempt to take down the legitimate Iraqi security forces," it said. (AFP)
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